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Is the entire chip maintaining a temperature of -200°C, or is the heatspreader being cooled with a liq. N2 cooler? Also, for how long is a processor stable for after its ambient temperature starts to fall. Unless the CPU is completely submerged in liq. N2 and then operated from inside that environment, it cannot reach -200°C.
So was its cooler at -200 or was the CPU enveloped in a cooler or something?
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